The Saiki Saiki no Mi (Saiki derives from saikikku, the Japanese word for psychic) is a Paramecia type Devil Fruit that permits the person who ate it various forms of psychokinesis. In Hilbert's case, his powers extend beyond what a normal psychic can do, using various forms of elemental psychic attacks and creating objects from his imagination. It was eaten by Peytan E. Hilbert of the Psy-Mar Pirates.

One of the abilities a user with this fruit can use is to different forms of elemental psychokinesis attacks, ranging from fire to water to wind. The user could also create objects from their imaginations, creating them into reality and using these items to help attack or defend the user. All of these attacks are invisible to many people; only the user and those with special vision (ex. Nash, Haki users) could see these attacks.

Similar with other Devil Fruits, the user will lose his ability to swim. However, since the user is more of a medium to long range fighter, this leaves him/her open to short range attacks and possible firearms. This only depends if the user is not good at evading, and is also not capable of dodging from multiple angles. The invisiblity can also be a problem to allies of the user, since a majority of those cannot see the attacks and they run the risk of injuring themselves from friendly-fire, especially with more destructive and wide-area moves.